I made this list because currently the one found here has broken tooltips, so you manually have to click on each one to see what they do.

Comment by dblink

I think it's more likely just a mashup of e-mail, which is "instant" compared to snail-mail (the old version of ingame mail), and the fact that it's a guild perk, instead of being a tribute to google mail.

Comment by Tropix

This is no reference, this is commercial sponsored by Google, for your information g-mail is copyrighted.

Comment by Moodknight

...good when ur guild has friends....in high places xD

Comment by Althizor

I'm glad it specifies in game mail.

The post office was going to get a lot of angry letters from me whenever I sent a package to a guild member I know in real life and it didn't arrive instantly.

Comment by Euroguy

An obvious reference to... oh what's the point?

Comment by Jazen

You can already do this through clever use of Mobile Banking, available much sooner. Makes this essentially not a perk and just filler.

Comment by Nulgar

Well it does make it easier though. While you right, a quick exchange can be arranged via guild bank and Mobile Banking, that method relies on a guild bank tab which is accessible by both sides, and allows for enough withdrawals/day to complete the transaction, e.g. a recipe with several stacks of materials would be too much in case the recipient cannot withdraw that many stacks per day, or has already used them up (or already used Mobile Banking in the last hour)Getting the guild master involved can help with that, sure, but this perk right here makes it all so very much easier.

Comment by yobo

with a large enough guild and a close knit team, this perk is amazing.This in connection with the Guild Roster is amazing.The guild profession roster and g-mail essentially connects everyone's profession.

Comment by Guy19

As you can see, the way it currently is, all but two of these will be immediately available to a lvl 25 guild. Hope the list helped, feel free to add to it if more is announced. :)

Comment by QuickBASIC37

Now that in 5.0.4 every level appropriate quest counts for exactly 60,000 guild exp, we can calculate how many quests a guild would need to do in order do level their guild. For people, like me, who are solo-leveling a guild for their own personal use, it is now possible to do so quite easily.

Daily quests from Tol Barad, Firelands, Therazene, etc. This includes Wrath of the Lich King dailies that are green (they go gray at level 93, or Burning Crusade daily quests (until they go gray at lvl83).

And as a rule of thumb, any other quest from 1-90 including those in starting areas, that counts towards 3000 Quests Completed.

The best advice you can get for leveling a guild is: Get out of the Dungeon Finder! Now that all level appropriate quests give 60,000exp, leveling a character through zones is going to be the quickest way to level a guild as there are only so many level appropriate quests (mostly dailies) at max level.